Which has more momentum, a speeding baseball or an ocean liner at rest in a harbor?
Baseball.
Ocean liner.
Both the same.
Can't say without more information.
2 . A truck moves with a certain momentum. If both its speed and its mass are doubled, how much greater is its momentum?
Two times.
Four times.
Eight times.
Unchanged, the same.
3 . If a fast-moving object strikes you, you'll experience less force of impact if you can
shorten the time the momentum decreases.
increase the time the momentum decreases.
either shorten or increase the time, for the result is the same.
4 . If your speeding car slams into a haystack and comes to rest, how will the IMPULSE that acts on it compare with slamming into a brick wall and coming to rest?
The impulse will be more.
The impulse will be less.
The amount of impulse will be the same either way.
5 . A fast-moving massive car has a head-on collision with a slow-moving light car. Upon which is the impulse greater?
The massive car.
The light car.
Impulse is the same on both.
More information is needed to correctly answer this.
6 . A cannon with a long barrel fires a shell faster because the shell experiences a greater
acceleration.
impulse.
change in inertia.
None of these.
7 . If superman in space throws a boulder with 10 times as much mass as himself, and the boulder leaves his hands at 100 km/h, how fast does superman recoil?
The same speed, 100 km/h.
10 km/h.
1000 km/h.
None of these are correct.
8 . Two identical gliders slide toward each other on an air track. One moves at 2 m/s and the other at 1 m/s. If they stick together, the combination slides at
0.5 m/s.
1 m/s.
1.5 m/s
2 m/s
2.5 m/s.
I will be happy to check your thinking.
inertia
1. In order to determine which object has more momentum, we need to know both the mass and velocity of each object. The momentum of an object is given by the equation P = mv, where P is momentum, m is mass, and v is velocity. Without more information about the mass and velocity of the baseball and the ocean liner, we cannot determine which has more momentum. Therefore, the correct answer is "Can't say without more information."
2. Momentum is directly proportional to both mass and velocity. If both the speed and mass of the truck are doubled, the momentum will increase by a factor of 2 x 2 = 4. Therefore, the correct answer is "Four times."
3. The force of impact is directly related to the rate of change of momentum. By increasing the time over which the momentum decreases, the force can be reduced. Therefore, the correct answer is "increase the time the momentum decreases."
4. Impulse is given by the equation J = ΔP, where J is impulse and ΔP is change in momentum. When the car slams into a haystack and comes to rest, the change in momentum is greater than when it slams into a brick wall and comes to rest. This is because the haystack provides more time for the car to come to a stop, therefore reducing the force experienced during the collision. Therefore, the correct answer is "The impulse will be less."
5. The impulse experienced by an object is equal to the change in its momentum. In a head-on collision, the impulse is the same on both objects involved. Therefore, the correct answer is "Impulse is the same on both."
6. The long barrel of a cannon accelerates the shell and allows it to experience a greater impulse. The impulse experienced by an object is equal to the change in its momentum, and a longer barrel provides a longer time for the propelling force to act on the shell, therefore resulting in a greater change in momentum. Therefore, the correct answer is "impulse."
7. According to the law of conservation of momentum, the total momentum of an isolated system remains constant. In this scenario, Superman and the boulder make up an isolated system, so their total momentum before and after the throw must be the same. Since the boulder has 10 times the mass of Superman and leaves his hands at a speed of 100 km/h, Superman will recoil in the opposite direction with a speed that is 1/10th of the boulder's velocity, which is 10 km/h. Therefore, the correct answer is "10 km/h."
8. According to the law of conservation of momentum, the total momentum of an isolated system remains constant. In this scenario, the gliders sliding towards each other make up an isolated system. Since they stick together after the collision, their total combined mass is double that of each individual glider. Using the equation P = mv, the combined momentum of the system after the collision is (2 + 1) × (2 m/s + 1 m/s) = 6 kg·m/s. Dividing this by the combined mass of 3 kg, we get a velocity of 2 m/s. Therefore, the correct answer is "2 m/s."